/*
XPTracker - Alternative Agile Tracking Tool
Copyright (C) 2006-2009  Stephen Starkey

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/
package org.xptracker.web;

import org.apache.commons.lang.StringUtils;

import java.util.Stack;

public class History {
  private Stack<String> pages = new Stack<String>();

  public void clear() {
    pages.clear();
  }

  public Stack<String> getPages() {
    return pages;
  }

  public void setPages(Stack<String> pages) {
    this.pages = pages;
  }

  public void push(String page) {
    if (pages.isEmpty() || !StringUtils.equals(page, pages.peek())) {
      pages.push(page);
    }
  }

  public void rollback(Integer depth) {
    while (pages.size() > depth) {
      pages.pop();
    }
  }
}
